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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Applications of route monitoring groups

Applications of route monitoring groups

Service Overview

To improve network reliability, most carriers implement device-level redundancy by deploying two devices. The two devices back up each other or share traffic load. If one of the devices fails, the other device takes over services. Despite the benefit of enhanced network reliability, you must dual-home other devices to the two devices, which may introduce link reliability and load balancing issues.

Networking Description

As shown in Figure 12-2, BRAS 2 backs up BRAS 1. NPEs on the user side are dual-homed to the two BRASs to load-balance traffic, and the two BRASs are connected to ME devices on the network side.
  • If the link between BRAS 1 and Device A or between BARS 1 and Device B fails, the link bandwidth between BRAS 1 and the IP core network decreases. The NPEs, however, cannot detect the link failure and keep sending packets to the IP core network through BRAS 1. As a result, the other link between BRAS 1 and the IP core network may be overloaded.
  • If the links between BRAS 1 and Device A and between BARS 1 and Device B both fail, only the links between BRAS 2 and the IP core network are available. The NPEs, however, cannot detect the link failure and keep sending packets to the IP core network through BRAS 1. As a result, the packets are discarded.
Figure 12-2 Route monitoring group

Feature Deployment

To address the packet drop issue, deploy a route monitoring group on each BRAS, and add network-side routes of the BRAS to the route monitoring group. If the down-weight sum of the route monitoring group reaches the threshold of a service module that is associated with the group, the RM module will notify the service module to trigger a primary/backup access-side link switchover. This mechanism prevents traffic overload and service interruptions.

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Updated: 2019-01-04

Document ID: EDOC1100059473

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